Pip-compile-multi

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* Add option ``--annotate-index`` (thanks to john-bodley 160).

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* Enable accidentially disabled ``--upgrade`` option.

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* Minor fixes to packaging and documentation.

Warning: this version is broken and won't pass ``--upgrade`` option to ``pip-compile``.
If you have this version installed, you need to manually upgrade it.
For example, using command::

pip-compile-multi --upgrade-package pip-compile-multi

Like in this `PR <https://github.com/mozilla-releng/shipit/pull/1>`_.

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* Fixed MANIFEST to include features directory

Warning: this version is broken and won't pass ``--upgrade`` option to ``pip-compile``.
See notes for 1.5.6_ for details.

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* Refactored features to separate modules.
* Allow passing verify options after verify command.
* Trim irrelevant entries from the traceback.

Warning: this version is broken and won't install ``features`` directory.
See notes for 1.5.6_ for details.

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* Added option ``--allow-unsafe``. (thanks to mozbhearsum 157).